Food mixer



Sept- 25, 1951 c. H. SPARKLIN ET AL 2,568,773

Foon MIXER Filed Dec. 2o, 194e v 3 sheets-sheet 1 y m ZZ /d Sept. 25,1951 c. H. SPARKLIN Er AL FOOD MIXER 5 SheetS-Sheet 2 Filed Deo. 20,1945 v 07AM@ f Sept 25, 1951 c. H. SPARKLIN ET AL 2,568,773

FOOD MIXER 5 Sheets-Sheet 5 Filed Deo. 20, 1946 Patented Sept. 25, 1951:rluNn en oF Irc E FOD MIXER "Charles I-L Sparklinand "GeorgeC Sporney,Chicago,v I-ll.,'^assignors to "BirtmanfElectric Company,`:incorporation of Illinois ApplicationDecembcr 20.194,6, Serial No.717,478

, 11'Claims. 1

v:This -invention'relates to a variablespeed vmotor :ofthe type adaptedto .be -used on foodmixers and =.the;Jike,'-anctrelatesalso tofanimproved. means l for mounting-aI motor "member on amounting e'memberfsuchlas'a pedestal.

The motor, 'which .is appart,4 of this invention, iis uparticularly 5adaptable for use .on Y .food mixers and thelike.-,'I'he-.motorvisuuitecompact incon- .sstruction fand., is providedwitha yariable speed facontrolithat operates .overa .wide speedrange.

.'Ilhefimotorffisfprouidedwith. .a handle preferab/ly'eextendinglongitudinally. ofthe motorA casing and yjoined thereto-byranenlarged hollow section. The speed .control/:means is lpreferablylocated in this .[fhollowysection zwithzthe member used for setting l,.thel speed bei-ng located ontheouter surface of the .hollow i` sectionyinfinger-manipulative position. -Thisfimprovedmoton when used .on afood mixer, provides fa lsubstantially.. constant speed at any speedsetting over -,.a wide range. It y.may be .mountedon-a .mountingmembersuch as an up- -.standing ,'.armcfand employed lke. an.ordinary mixer-in4beating 4materials located in .a container beneaththe motor.,The.motor,member mayalso j befgrasped. :bythe handle 7and' removedfromjits Amounting f member .so that' it -can be. operated1independentlyof itsymounting. Thus foodheating ionla, stoye .maybe.mixed whilethe cookholds the MYmixerlin her hand. Improved meansareprovided fiorl readilymounting. ,themotor .on the upstandlingaarmtand`for. readily .dismountingk the. .motor xtherefrom. .Thesev` improved.meansv also. forma. a

partV of ...this invention.

One-.of the important 4featuresof .this invention `.is y.the.campactnessl of thefmotor member. rThis ncompactness 4Visaprovided byhayingthe principal por-tion-offthe speed regulatingmeans locatedin theenlarged hollow: portion .atthe baseer, .the handle and-1 by making theremainder. ,of the handle alsohollow so vthateJ condenser. or the.,.like may -,be located in rthis latter. hollowfgportion. k"Ihecontrolmeansbywhich the speed is regulated .preferably mountedin .theenlargedhollowY portion of the `lhandle andA is located ,with its topsurface substantiallyflush vwith the outer. handle surfaceand Awith theedgesextending beyond the outer,- surface so that. these edgesr may freadily be ,grasped by the lingers.

.The inyentionwillbe.,described as related. to A.one,.emloodin'ient ofIVthe .same assetout inthe ,c accompanying drawings. Otthe drawings, Fig.;1 ..isf anelevation, partially v`in section,of ther` food mixerembodying .the invention; Fig. 2,.- isaplan l.fvievir@inthe.mixer ofFig.` 1;. Fig. Elisa horizontal section partially broken away and takenalong .sectionltakenfalongiine 4--4 of Fig. 2; Fig. 5 isHarhorizontalvsectiontalzen along line `-5 of ,,Fig.,4;Fig.'.6. is avertical section taken along line l 6-.`-.6.of.Fig. 4;.and1ig. 7. is asection taken along ,The food mixer is shown'in the .accompanyingdrawingscomplisesa base member .IU and upstandingiarmi I Iy atoneendthereof, a top portion I2 on the upstandingarm-and,hingedlyattached :longitudinally extending handle I5 opposite the .top portionLI 2.0i. themounting arm, a pair ofdeipendingbeater, shafts I 6';extending from Athe moftor member.w I 4,. .a..bowl. I'llforholdingmaterials to-.ba beaten, anda rotatable yplatform I8 supr.portinglthe lbowl I ,'I

The baseninernberl I0 is adapted` to support -looWrls of different-diameters.- It-is provided -With iai-stud; member I 9; :having .afcylindrical bearing h:opening "2li/thereinv and at least a second vstuda member 'Iarfhavngasimilar bearing opening at l:bearing opening a andsupports theplatform I8 withthe\bowl.thereon. The rotation ofthezbeatfersncausesrotationrof thebowl I1. `A larger bowl #may f beused"by using a larger Vplatform and -fmountingfit'in the bearing opening 20.The bowl v"His-provided with a downwardly extending bot- Atom'c'rcularfange'f 22 and is-supported by downwardly extendingperipheral flanges 23 Yonthe platform I8.

"Themotor'member I4 comprises a-vertical shaft and acornmutator 29beneath the armature'Z'I.

"The upper' bearing A25 yis held vin a horizontalplate '30 extendingacross'the motorcasing I- with the plate beingprovided with spaced holes32l therein. 'Ihepbottom-bearing 26 is heldin a'gearwcasing-33.

'Within' theggear casingSS, there is locateda pairof horizontallyaligned meshing gears '334 Witheach gear being vformed with a cylindri-K gear 3&1 is mounted concentricallywith the ngear 38 and'is'driven"`thereby. "This smallerf-gearf-39 3 meshes with one of themain gears 34 to drive the beater shafts 6.

Mounted on the top end of the motor shaft 24 beyond the top bearing 25there is located a rotatable horizontal plate 49. lOn the bottom surfaceof this rotatable plate are located radial fins 4| serving as fan bladeswhen the rotatable plate 40 is rotated. On top of the plate 40 there islocated a second plate 42 spaced from the first plate 49. Between thetwo plates 40 and 42 are located centrifugally responsive lever arms 43rotatably mounted at one end thereof. Each lever arm 43 bears againstone arm 44 of a bell crank also located between the two parallel plates40 and 42. The other arm 45 of each bell crank bears against one arm ofa second bell crank 41 mounted on the second plate 42 and atsubstantially right angles thereto. The second bell cranks 41 have theirother legs extending toward the motor shaft and are adapted to bearagainst a member 49 slidably mounted on the upper end of the motor shaft24. The lever arms 43, bell cranks 45, and second bell cranks 41 arearranged so that as the speed of the motor increases, the member 49 ismoved outwardly on the shaft 24 by the centrifugal forces set up in thelever arms 43. This construction or the speed control means is shown anddescribed in greater detail in the Charles H. Sparklin copendingapplication No. 580,114, led February 28, 194.5, now Patent Number2,532,345, issued December' 5, i950.

The handle I has an enlarged hollow portion 49 at its upper end thereofin communication with the top of the motor casing 3 In this hollowportion is located a pair of contact arms comprising a lower arm 5U andan upper arm 5|. These arms are rotatably mounted about a fulcrum 52also located within the hollow portion 49. The free ends of the arms 58and 5| are provided with cooperating contact points 53 and 54. The arms58 and 5| are normally held in contact with each other by a tensionspring 95. The lower` Contact arm 53 is provided with an outwardlyextending lever arm 55 extending beyond the fulcrum 52 to a pointadjacent the outer end of the movable member 48 on the end of the shaft24. The outer end of the lever arm 55 is provided with a button 56 forcontacting the member 48. A U-shaped spring 51 is provided with the baseof the U bearing against the outer end of r the upper contact arm 5! andthe prongs of the spring imbedded in the upper casing section 69adjacent the hollow portion 49. Each prong of the spring is formed witha coil 91 intermediate its ends in order to give the spring greaterresiliency.

In order to regulate the speed of the motor, the contact arms 59 and 5iare movable to different positions around their fulcruin 52. As shown,this movement is caused by rotating a circular disk 58 rotatably mountedon a thin strip of metal 59 fastened across an opening 50 in the uppersurface of the hollow portion 49. rlhis strip of metal 59 is held byscrews 6| so that the top surface of the disk 58 is substantially flushwith the outer surface of the top of the hollow portion 49, but with theedges of the disk extending beyond the hollow portion 49 so as to bereadily grasped by the nngers. The bottom of the disk 58 is providedwith a cam surface 52 adapted to bear against a stud 63 mounted on theupper contact arm 5|. The spring 51 holds the stud 63 against the camsurface 62 and urges the contact arms 5U and 5| toward a low speedposition. As the disk 58 is rotated about its central mounting, the camsurface 62 causes movement of the contact arms 50 and 5| about theirfulcrum 52. As the speed of the motor depends upon the position of thecontact arms 50 and 5I, this movement serves to regulate the speed ofthe motor. When the contact arms are in the position shown in Fig. 4,the motor is operating at substantially its lowest speed. The arms 50and 5| are so arranged that when the stud 63 is at the lowest point 0nthe cam surface 62, the contact points 53 and 54 will be separated sothat no current flows between them. This is the off position for themotor. The outer surface of the disk 58 is preferably provided with agraduated scale 65 that can be aligned with the tip of a pointer 66 onthe metal mounting strip 59.

The motor casing 3| is provided with upper Ventilating openings 61 andlower Ventilating openings 68. Cooling air is thereby circulated throughthe openings 51 and 68 and openings 32 in the plate 30 by means of thefan blades 4|. The motor casing 3| is divided into an upper portion 69and a lower portion 10 along a horizontal line 1|. This horizontal lineforms one side of the lower Ventilating openings 58. The two casingsections 69 and 10 form a circular hole 12 at the one point supporting acollar 13 of a resilient material such as rubber through which theelectric cord 14 extends. Cooperating semi-circular openings may beformed in the two casing sections, as shown, or one casing section maycontain the hole and the other casing section merely be straight andform one side thereof.

The handle |5 is preferably made hollow so as to provide a housing for acondenser 15 located within the handle |5. This condenser is connectedby wires 16, or the like, across the contact points 53 and 54 to reducesparking between the points. The condenser 15 has its bottom surfaceresting on a stud 16 located on the inner surface of the handle I5.

In order that the motor member |4 may be readily mounted on the topportion l2 of the upstanding arm the motor member is provided with anon-cylindrical projection such as rectangular projection 81 upon whichis mounted a substantially cylindrical projection 11. The projectionsare adapted to be held within similarly shaped slot 91 and cylindricalsocket 18, respectively, in the top portion I2. The cylindricalprojection 11 is provided with a circumferential groove 19 near itsouter end arranged substantially at right angles to the axis of thecylindrical projection. Arranged at the top of the socket 18 and alignedwith the groove 19 when the projections are in place, there is located acam member 8U adapted to be moved into and out of engagement with thegroove 19. This cam member has a contacting surface 8| in the shape of afrustrum of a cone. The base of the frustrum is attached to acylindrical member 82 provided with screw threads 83 engaging thethreads in a threaded hole 84. The outer end of the cylindrical member82 is provided with a head 86 which may be grasped by the lingers. Asthe head 86 is turned in one direction, the frustrum 8| is moved out ofengagement with the groove 19 so that the projections 11 and 81 may bewithdrawn from the socket 18 and slot 91. When the projections arere-inserted in the socket and slot, the head 85 may be turned in theopposite direction to move the frustrum into engagement with the groove19 and lock the projection 11 within the socket 18. The projection 11serves to hold the motor member in place and the projection 81 serves toprevent rotation of the motor member.

The two sections 69 and 10 of the motor casing 3l are held by spacedvertical bolts 88 extending through mounting blocks 89. The handle I5 isheld in place by bolts 90 extending between the outer surface of thehandle l5 and the motor casing 3|. As can be seen from Fig. 4, the lowerbolt 90 has its head within the central hollow of the section of thehandle I5- Having described our invention as related to the embodimentset out in the accompanying drawings, it is our intention that theinvention be not limited by any of the details of description unlessotherwise specified, but rather be construed broadly within its spiritand scope as set out in the accompanying claims.

We claim:

1. In an apparatus including a rotatable shaft, a rotatable memberoperated by the shaft, speed responsive means on the rotatable member, amovable member operated by the speed responsive means and movablerelative to the rotatable mem ber as the speed is changed, a casing forthe apparatus, apparatus comprising: a handle spaced laterally from thecasing and having an enlarged hollow connecting section at one end ofthe casing, a make-and-break switch located within the hollow sectionmounted for rotation about a fulcrum and including a pair of armscarrying cooperating contact points, a lever arm attached to one of thecontact arms and extending beyond the fulcrum to a point adjacent themovable member, means for causing separation of the contact arms whenthe movable member moves the lever arm, means for changing the positionof the contact arms about the fulcrum, and means normally urging thecontact arms together.

2. The apparatus of claim 1 wherein the fulcrum is also located withinsaid enlarged section.

3. The apparatus of claim 1 wherein the means for changing the positionof the contact arms comprises a finger-manipulative member located onthe outer surface of said enlarged sectien.

4. The apparatus of claim 1 wherein the contact arms are arranged withone nearer the shaft than the other and the lever arm is attached to theContact arm nearer the shaft.

5. The apparatus of claim l wherein there is provided a spring meansurging the Contact arms toward a low speed position.

6. The apparatus of claim l wherein the hollow section is located at theend of the casing adjacent the rotatable member, the fulcrum ispositioned within the hollow section, and the Contact arms lie at anacute angle to the shaft, whereby movement of the lever arm away fromthe shaft causes movement of the contact arms toward the shaft,

7. In an apparatus including a rotatable shaft, a rotatable memberoperated by the shaft, speed responsive means on the rotatable member, amovable member operated by the speed responsive means and movable awayfrom the rotatable member as the speed is increased, and a casing forsaid apparatus, apparatus comprising: a handle spaced laterally from thecasing and joined thereto by an enlarged hollow section at the end ofthe casing adjacent said rotatable member, a make-and-break switch inthe hollow section mounted for rotation about a fulcrum and including apair of arms carrying cooperating contact points, with one of said armsbeing located nearer the end of the shaft opposite the rotatable memberthan the other, a lever arm rigidly attached to said nearer arm andextending beyond the fulcrum to a point adjacent the movable member, aspring means bearing against the farther contact arm for urging thecontact arms toward a low speed position, means for changing theposition of the contact arms about the fulcrum, and means normallyurging the contact arms together.

8. The apparatus of claim 7 wherein the fulcrum is also located withinsaid hollow section.

9. The apparatus of claim 7 wherein the means for changing the positionof the contact arms comprises a finger-manipulative member located onthe outer surface of said enlarged section.

10. In an apparatus including a rotatable shaft, a rotatable memberoperated by the shaft, speed responsive means on the rotatable member, amovable member operated by the speed responsive means and movable awayfrom the rotatable member as the speed is increased, and a casing forsaid apparatus, apparatus comprising: a handle spaced laterally from thecasing and joined thereto by an enlarged hollow section at the end ofthe casing adjacent said rotatable member, a make-and-break switch inthe hollow section mounted for rotation about a fulcrum also located inthe hollow section and including a pair of arms carrying cooperatingcontact points, with one of said arms being located nearer the end ofthe shaft opposite the rotatable member than the other, a lever armrigidly attached to said nearer arm and extending beyond the fulcrum toa point adjacent the movable member, a spring means having one endbearing against the inner surface of the farther contact arm for urgingthe contact arms toward a low speed position, means normally urging thecontact arms together, and means for changing the position of thecontact arms about the fulcrum.

11. In a speed control apparatus including a casing and a handletherefor, a speed control member capable of being rotated to vary thespeed and comprising a rotatable member located in an opening in thehandle and having its top surface substantially flush with the topsurface of the handle, said rotatable member having sides extendingbeyond the side of the handle to provide for finger manipulation.

CHARLES H. SPARKLIN. GEORGE C. SPORNEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,932,747 Mross Oct. 3l, 19332,092,995 Chamberlain Sept. 14, 1937 2,188,559 Taylor Jan. 30, 19402,241,528 lStrauss et al. May 13, 1941 2,427,099 Kennedy Sept. 9, 19472,455,026 Seyfred Nov. 30, 1948

